save arrays from input in php code example

Example 1: how to save array of inputs in php

<?php
    echo '<input type="hidden" value="' . htmlspecialchars($data) . '" />'."\n";
?>

Example 2: how to save array of inputs in php

<?php
    echo "<textarea name='mydata'>\n";
    echo htmlspecialchars($data)."\n";
    echo "</textarea>";
?>